Newark Liberty International Airport (IATA: EWR, ICAO: KEWR, FAA LID: EWR), originally named Newark Metropolitan Airport and later Newark International Airport, is an international airport which straddles the municipal boundary between Newark and Elizabeth, New Jersey. The airport is owned by the city of Newark and operated by the Port Authority of New York and New Jersey. It is about 15 miles (24 km) southwest of Midtown Manhattan (New York City). Newark Airport was the first major airport in the United States and is the New York-New Jersey metropolitan area's busiest in terms of flights.

The airports in the New York metropolitan area combine to create the largest airport system in the United States, the second largest in the world in terms of passenger traffic, and largest in the world in terms of total flight operations. In 2013, Newark Airport handled 35 million passengers, JFK handled 50.4 million, and LaGuardia handled 26.7 million.

Newark is the third-largest hub for United Airlines (after Chicago-O'Hare and Houston-Intercontinental), which is the airport's largest tenant (operating within all of Terminal C and part of Terminal A). Newark's second largest tenant is FedEx Express, whose third largest cargo hub uses three buildings on two million square feet of airport property.